Palindromi

s = input()

length = len(s)

charlist = list(s)
revlist = charlist[::-1]


def change_char(half):
    count=0
    for i in range(int(half)):
        if revlist[i] != charlist[i]:
            count+=1
        else:
            pass
    return count
    

if length%2 == 0:
    half = length/2
    print(change_char(half))
        
else:
    half = (length-1)/2
    print(change_char(half))

Test 1 (public)

Verdict: ACCEPTED

Test 2 (public)

Verdict: ACCEPTED

Test 3 (public)

Verdict: ACCEPTED

Test 4 (public)

Verdict: ACCEPTED

Test 5 (public)

Verdict: ACCEPTED

Test 6 (public)

Verdict: ACCEPTED

Test 7 (public)

Verdict: ACCEPTED

Test 8 (public)

Verdict: ACCEPTED

Test 9 (public)

Verdict: ACCEPTED

Test 10 (public)

Verdict: ACCEPTED